JP2018538653A - 固体ナトリウムイオン電池用のnasicon構造を有する電解質材料およびその製造方法 - Google Patents
固体ナトリウムイオン電池用のnasicon構造を有する電解質材料およびその製造方法 Download PDFInfo
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Abstract
Description
9.249gのZrO(NO3)2、6.374gのNaNO3および2.310gのSc(NO3)3を100mlの脱イオン水に撹拌下で溶解した。すべての塩を溶解した後、10.417gのオルトケイ酸テトラエチルを添加し、引き続き撹拌した。オルトケイ酸テトラエチルの加水分解を促進するために、2mlのHNO3(65重量%)を系に添加した。オルトケイ酸テトラエチルを完全に加水分解した後、同様に、2.8769gのNH4H2PO4を撹拌下で添加した。リン酸塩の添加により、今まで均質に存在していた水性系が混合物に変化し、これはジルコニア−リン酸塩錯体化合物のコロイド状沈殿物を有するものであった。
実施形態1で製造した白色の粉砕粉末1gを、直径13mmの円筒状の圧入機に移し、室温で100MPaの一軸圧力下でプレスした。このようにしてプレスした錠剤を引き続いて1260℃で約6時間焼結した。純粋な白色の錠剤を得た。これらの焼結した錠剤の密度は理論密度の95%超に達した。図2からわかるように、CuKα線によるSiemens D4 X線回折装置(XRD)を用いた検査は、所望の単斜晶系の結晶構造を除いて、これらの錠剤中にはさらなる相の存在が全くないことを示した。参照として、結晶学的基準(JCPDS:01−078−1041)を使用したが、これは、図2においても同様に見られる。
実施形態2に従って製造されたNa3.4Sc0.4Zr1.6(SiO4)2(PO4)の、密な、白色のプレスした錠剤の平坦な両面上を金で被覆した。−20℃〜100℃の温度で、7MHz〜1HzのAC周波数を有する従来の電気化学システム(Biologic VMP−300)を使用して、プレスおよび焼結した錠剤についてインピーダンススペクトルを記録した。インピーダンス分光法を用いて、固体中のイオン輸送プロセスを調べることができる。インピーダンス分光測定は比較的容易に遂行でき、正確な伝導率結果が得られる。
750.8gのZrO(NO3)2、334.0gのNaNO3および39.51gのSc2O3を6リットルの脱イオン水に撹拌下で溶解させた。すべての塩を溶解した後、1010gのオルトケイ酸テトラプロピルを添加し、引き続き撹拌した。オルトケイ酸テトラエチルの加水分解を促進するために、650mlのHNO3(65重量%)を系に添加した。オルトケイ酸テトラエチルを完全に加水分解した後、252.2gの(NH3)2HPO4を、同様に、撹拌下で添加した。リン酸塩の添加により、これまでの均質な水性系が混合物に変化し、酸化ジルコニウム−リン酸塩錯体化合物のコロイド状沈殿物が形成された。
Claims (14)
- Na2+xScxZr2−x(SiO4)2(PO4)化合物(式中、0≦x<2)をベースとするNASICON型構造を有する電解質材料の製造方法であって、
−所望の化学量論に対応して、ナトリウム、スカンジウムおよびジルコニウムを、水溶性硝酸塩、酢酸塩または炭酸塩の形態で、ならびに可溶性ケイ酸塩またはオルトケイ酸または有機ケイ素化合物を溶解した形態で含む、酸性水溶液を提供するステップ、
−続いて、所望の化学量論に対応して、リン酸またはリン酸二水素アンモニウムまたは他の可溶性リン酸塩を添加し、その際、二酸化ジルコニウムリン酸塩錯体がコロイド状沈殿物として形成するステップ、
−混合物を次に乾燥させ、そしてか焼するステップ、
を有する、上記の方法。 - 出発物質が、0≦x<2、特に0≦x<0.6のための化学量論に対応して選択される、請求項1に記載の方法。
- 該混合物を、60℃〜120℃の温度で乾燥させる、請求項1または2に記載の方法。
- 乾燥した混合物を、700℃〜900℃の温度でか焼する、請求項1〜3のいずれか一つに記載の方法。
- 乾燥し、そしてか焼した混合物が、粉末として約0.1μmの粒径を有する粒子を有する、請求項1〜4のいずれか一つに記載の方法。
- 乾燥し、そしてか焼した粉末を引き続いて粉砕する、請求項1〜5のいずれか一つに記載の方法。
- 乾燥し、か焼し、そして粉砕した粉末を、引き続いてプレスする、請求項1〜6のいずれか一つに記載の方法。
- 乾燥し、か焼し、そして粉砕した粉末を、1200℃〜1300℃の温度でプレスする、請求項7に記載の方法。
- 乾燥し、か焼し、そして粉砕した粉末を、50〜100MPaの圧力でプレスする、請求項7または8に記載の方法。
- 請求項1〜9のいずれか一つに従って製造可能な、Na2+xScxZr2−x(SiO4)2(PO4)化合物(式中、0≦x≦0.6)を含むNASICON構造を有するナトリウムイオン伝導性粉末であって、
−0.1μm未満の粒径を有し、かつ、
−25℃で1・10−3S/cm超のイオン伝導率を有する、
上記の粉末。 - 請求項1〜9のいずれか一つに従って製造可能な、Na2+xScxZr2−x(SiO4)2(PO4)(式中、0.3≦x≦0.6)化合物を含むNASICON構造を有するナトリウムイオン伝導性粉末であって、
−0.1μm未満の粒径を有し、かつ、
−25℃で3・10−3S/cm超のイオン伝導率を有する、
上記の粉末。 - 25℃で1・10−3S/cm超のイオン伝導率を有する、請求項10に記載のナトリウムイオン伝導性粉末を含む、ナトリウム伝導性膜。
- 25℃で3・10−3S/cm超のイオン伝導率を有する、請求項11に記載のナトリウムイオン伝導性粉末を含む、ナトリウム伝導性膜。
- 理論密度の90%超の密度を有する、請求項10または11に記載のナトリウムイオン伝導性粉末を含む、ナトリウム伝導性膜。
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